Make minion commands context aware

[pass-by-value]

Validate Function Input for

• valid command (present and either runner or wheel or a valid module function)
• presence of all required arguments in case of module function

Number of text boxes should equal the number of required parameters (and allow more for addition of optional arguments)

[pass-by-value]

#87

[pass-by-value]

Sample inputs to try with

• test.ping
• webutil.userdel (and enter the required argument to add optional args)
• virtualenv.create (and enter the required arguments to add optional args)
• runner.*
• wheel.*

[pass-by-value]

Done as #89 and #90 are merged